Translation:Mishnah/Seder Moed/Tractate Sukkah/Chapter 1/6
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Mishnah 6
We may cover a succah with boards; these are the words of R'Yehudah. But R'Meir prohibits them.
If one put a board that is four tefachim wide on a succah, the succah is still valid and one can discharge his obligation with it, provided that he does not sleep beneath the board.